The XPTH 9 HDSI 180 T 710210-1 Humminbird Thru Hull Transducer helps you to locate the fish and determine the depth of water by sending and receiving signals underneath the boat. This device is equipped with dual/high-definition side imaging, as well as a built-in temperature gauge and a shaft diameter of 1". This plastic marine transducer has four beam angles at 20, 60, 86 and 55 degrees and also has four frequency levels that include 200, 83, 455 and 800 kHz for high-definition imaging. This unit is compatible for use with a variety of SI boat models. The kit includes the transducer, all required mounting hardware, a 30' cable, a fairing block and a product manual. This Humminbird transducer is a handy piece of equipment that can benefit both beginning and advanced anglers.